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camerax_demo

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首先，我们需要创建一个名为CameraXDemo的Java类，并在其中实现基本的拍照、录像和切换前后镜头功能。以下是详细的步骤：

1. 在AndroidManifest.xml文件中添加相机权限：



2. 在build.gradle文件中添加相机依赖：

dependencies {

    implementation 'androidx.camera:camera:1.0.0'

}


3. 创建一个名为CameraXDemo的Java类：

import android.content.Context;

import android.hardware.Camera;

import android.os.Environment;

import android.util.Log;

import android.view.SurfaceHolder;

import android.view.SurfaceView;

import android.widget.Toast;



import java.io.IOException;

import java.nio.file.FileSystems;

import java.nio.file.Path;

import java.nio.file.Paths;

import java.text.SimpleDateFormat;

import java.util.Date;



public class CameraXDemo {

    private static final String TAG = "CameraXDemo";

    private SurfaceView mPreview;

    private Camera mCamera;

    private Camera.PictureCallback mPictureTaken;

    private Camera.Parameters mPreviewSize;

    private String mOutputImagePath;

    private String mVideoPath;

    private SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd_HHmmss");



    public CameraXDemo(Context context) {

        mPreview = new SurfaceView(context);

        init();

    }



    private void init() {

        mCamera = CameraFactory.getInstance().openCamera();

        try {

            mPreviewSize = mCamera.getParameters();

            mPreviewSize.setPreviewSize(640, 480);

            mCamera.setDisplayOrientation(90);

            mCamera.setParameters(mPreviewSize);

            mCamera.startPreview();

        } catch (Exception e) {

            Log.e(TAG, "Error opening camera", e);

        }

    }



    public void takePicture() throws IOException {

        if (mPreview != null && mPictureTaken == null) {

            mPictureTaken = new PictureCallback() {

                @Override

                public void onPictureTaken(byte[] data, Camera camera) {

                    try {

                        savePicture(data);

                    } catch (Exception e) {

                        e.printStackTrace();

                    }

                }

            };

            mCamera.takePicture(null, mPictureTaken, mPictureTaken);

        } else {

            Log.e(TAG, "PictureCallback not set");

        }

    }



    public void savePicture(byte[] data) {

        String timeStamp = sdf.format(new Date());

        String picturePath = getPicturePath(timeStamp);

        try {

            FileOutputStream outputStream = new FileOutputStream(picturePath);

            outputStream.write(data);

            outputStream.close();

            Toast.makeText(mPreview.getContext(), "图片保存成功", Toast.LENGTH_SHORT).show();

        } catch (IOException e) {

            e.printStackTrace();

        }

    }



    public String getPicturePath(String timeStamp) {

        String path = Environment.getExternalStorageDirectory().toString() + "/CameraXDemo/" + timeStamp + ".jpg";

        return path;

    }



    public void switchCamera() {

        if (mCamera != null) {

            mCamera.release();

            mCamera = null;

        } else {

            try {

                mCamera = CameraFactory.getInstance().openCamera();

                mCamera.setDisplayOrientation(90);

                mCamera.setParameters(mPreviewSize);

                mCamera.startPreview();

            } catch (Exception e) {

                Log.e(TAG, "Error switching camera", e);

            }

        }

    }



    public void startRecording() {

        if (mCamera != null && mVideoPath != null) {

            try {

                mCamera.stopPreview();

                mCamera.takePicture(null, mPictureTaken, mPictureTaken);

                mVideoPath = Environment.getExternalStorageDirectory().toString() + "/CameraXDemo/" + sdf.format(new Date()) + ".mp4";

                new RecorderThread(mVideoPath).start();

            } catch (Exception e) {

                Log.e(TAG, "Error recording", e);

            }

        } else {

            Log.e(TAG, "No camera or video path set");

        }

    }

}


4. 创建一个RecorderThread类，用于录制视频：

```java
import android.content.Context;
import android.graphics.Bitmap;
import android.media.MediaRecorder;
import android.os.Handler;
import android.os.Looper;
import android.os.Message;
import android.support.annotation.NonNull;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.widget.Toast;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FileDescriptor;
import java.io.BufferedInputStream;
import java.io.FileDescriptor;
import java.io.FileOutputStream;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FileInputStream;
简易的camerax安卓相机，依照官网kotlin用例，转为java语法，实现了基本的拍照、录像、切换前后镜头功能
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